The grey might be a silkie cochin or a brittish tailed araucana (Pullet?)
The black one might be a French Black Copper Maran ( it is has feathered feet) or a Black Sex Link (Cockeral?)
The other two looked like chipmunks when they were little so I think they were either Gold Campine or Wyandotte (one of each?)

The pics don't enlarge when clicked, so I'm short on details. But overall, I'm thinking they're all mixed breeds.

the little blue/grey bird looks like a pullet. She could be a British Aracauna, or she could be a mix. Considering the other birds are mixed, that's the way I'm leaning for her. Not silkie or Cochin, though, that would have feathered legs. She looks quite a bit smaller than the other, is she younger or just little?

the other three all look to have lightly feathered legs, indicating one feather legged parent and one clean legged parent, thus mixed breeds. I see two cockerels, and two pullets.

Almost every blessed brown patterned bird has a chipmunk pattern as a chick, so that's really unreliable to tell breed, sorry.

Thanks, that is what I was afraid of. The brown one is definitely more aggressive than the others and with the red comb I had my suspicions. My daughter's teacher hatched these in class so I have no info on their breeds. I will need to give away the cocherals and get a couple of new pullets. I wonder if I can get some around the same age (7 weeks) this time of year? I am in Massachusetts.

You might check out your state thread in the "Where am I" section. Or, try a wanted ad on your local CL or FB is no one is advertising pullets for sale. It is a weird time of year, but someone might have a few to sell.